NWS Forecast Office Houston/Galveston, TX

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Last Map Update: Thu, May 21, 2026 at 3:28:24 am CDT

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Heavy Rainfall Risk Through Weekend

Flood Watch

Forecast Rainfall Totals

Current radar loop for Houston, TX.

Multiple rounds of showers and thunderstorms containing moderate to heavy rainfall expected through the weekend. Marginal Excessive Rainfall Risk (level 1 of 4) for most of Southeast Texas today into early Thursday. Slight Excessive Rainfall Risk (level 2 of 4) all of Southeast Texas on Thursday. Marginal Excessive Rainfall Risk (level 1 of 4) for all of Southeast on Friday. Slight Excessive Rainfall Risk (level 2 of 4) for all of Southeast Texas on Saturday due to potential additional shower/thunderstorm activity.

A Flood Watch is in effect from Thursday morning through Monday morning for portions of southeast Texas, including Jackson, Matagorda, Wharton, Fort Bend, Brazoria, and Galveston counties. Impacts include excessive runoff resulting in flooding of creeks, streams, and other low-lying and flood prone locations.

Unsettled pattern will lead to continued chances for showers and thunderstorms, with additional rounds of moderate to heavy rainfall. Periods of locally heavy rainfall are expected, through the weekend. Rainfall rates will peak in the 3-4+” per hour range in the heaviest downpours. This rainfall will generate runoff and river responses, especially where we see repeated heavy rainfall over the same locations leading to street flooding and river flooding potential through the weekend.

Current Weather Observations...

Location	Time (CDT)	Weather	Vsby. (SM)	Temp. (ºF)	Dewpt. (ºF)	Hum. (%)	Wind (mph)	Wind Chill / Heat Index (ºF)	Pres. (in)
Crockett	01:35	Rain \ Mist \ Lightning Observed	3	66	66	100	CALM	-	30.09
Caldwell	02:35	Lightning Observed	10	71	68	88	NNE 5	-	30.00
College Station	02:53	Partly Cloudy	10	70	67	90	ENE 5	-	29.97
Huntsville	02:53	Mostly Cloudy	10	70	67	90	ESE 5	-	29.98
Navasota	02:55	Mostly Clear	10	70	70	100	ENE 3	-	29.96
Conroe	02:53	Light Rain	10	70	68	93	CALM	-	29.97
Hooks Airport	02:53	Overcast	10	71	68	90	NE 6	-	29.96
Intercontinental Airport	02:53	Overcast	10	72	69	90	NE 9	-	29.95
Houston Hobby Airport	02:53	Overcast	9	74	70	87	NE 9	-	29.93
Sugar Land	02:53	Mostly Cloudy	10	74	69	84	ENE 8	-	29.93
Wharton	01:10	Light Rain	5	68	66	93	N 17G24	-	30.08
Pearland	02:53	Overcast	10	74	70	87	NE 9	-	29.95
Ellington Field	01:54	Mostly Cloudy	10	73	71	94	NNE 6	-	29.97
La Porte	02:35	Lightning Observed	10	73	71	91	NE 5	-	29.96
Angleton/Lake Jackson	02:53	Mostly Cloudy	8	73	72	96	NE 8	-	29.92
Galveston	05:52	Thunder In The Vicinity \ Light Rain \ Lightning Observed	10	73	70	90	NNE 10	-	29.99
Bay City	02:55	Mist \ Lightning Observed	6	73	73	100	NE 8	-	29.88
Palacios	02:53	Partly Cloudy	7	74	73	97	ENE 8	-	29.91
Rig 20 Miles SE of Galveston	02:55	Mostly Cloudy	10	77	71	83	ESE 10	-	29.94
Rig 20 Miles SE of Matagorda	03:00		9	77	77	100	E 12	-	29.94

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